<?php
class oferta {
    public $item;
    public $system_compra;
    public $station_compra;
    public $precio_compra;
    public $system_venta;
    public $station_venta;
    public $precio_venta;
    public $volumen;
    public $cargo;
    public $riesgo;
    public $ganancia;
}
?>
